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Common Problems with this unit is receiver overload from adjacent channels. There are a number of solutions to this which may or may not work in any given situation. Suggested solutions are :-


1). Fit a 3 to 6 dB pad in the receiver input. In local duplex use, with 4 watts output from the handhelds the loss of a few dB in input signal will not normally be noticed, but it does do wonders for the IP performance. RS do a nice range of BNC to BNC units 1 watt rated under the following parts numbers

3 dB ......404-862

6db ......404-878

10db ....404-884


2). Locate the receive antenna further from the radio users.

3). Check the transmit antenna location. In many cases it is the effects of many proximate transmissions on the base station frequencies that cause receiver overloading.

4). If all else fails fit CTCSS protection to the receiver. Note that if you are operating a number of different channels you should ensure that all the CTCSS tones in use are different, otherwise unwanted transmissions will still open the receiver if they have the same code. CTCSS does not fix the problem, but merely masks the effects. Unwanted co-channel CTCSS can be generated by other radio users ( i.e. Security ) on site and not just by other broadcasters.


Microphonic Base Stations.

The usual cause for this is that the internal BNC - BNC connector between the PA and the driver module has shaken loose and is vibrating on the adjacent metal work. ( Rusty Bolt Effect ). Fit some insulation around the joint ( electrical tape if nothing else is to hand ! ), and the problem should disappear.


Base Station Channels, our normal default Key Frequency List is available here.

New Key frequency list as a result of the JFMG changes is available here



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Last modified: February 09, 2006